How is secondhand smoke related to stroke?

01

Stroke must remain distinct from coronary disease

CDC and the US Surgeon General conclude that secondhand smoke causes stroke in adults who do not smoke.

Stroke, coronary disease, transient ischaemic attack and other vascular outcomes are not one endpoint, and stroke subtypes cannot be inferred from exposure.

[1]

02

Exposure and comparator definitions

Immediate vascular and clotting effects support plausibility, but they cannot time or attribute an individual's event.

Home, work and shared-space studies define duration and intensity differently; smell or time in a room is not a personal dose.

[1][2]

03

The causal statement does not identify a stroke subtype

Studies may combine stroke events, examine a subtype, count hospital admissions or use stroke mortality. An estimate for all stroke cannot be relabelled as the same estimate for ischaemic or haemorrhagic stroke. Exposure categories also vary: living with a person who smokes is not identical to a measured workplace concentration. Read the event definition together with the exposure comparison; the causal public-health conclusion remains stronger than a personal explanation of one event.

[1][2]

04

Keep evidence reading separate from urgent care

Removing indoor smoke sources is environmental protection. If stroke is suspected now, contact local emergency medical services immediately; do not wait to decide whether smoke was involved. This page does not interpret symptoms, scans or rehabilitation. The CDC emergency number is US-specific.

[2][3]